Loss of the ADIRU input Data through the Channel B or disagree between Aircraft and Engine sensors on Engine 1
 1. Possible Causes
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 - PS12 Sensing Line

 - T12 temperature sensor

 - ADIRU-1 (1PF1)

 - ADIRU-2 (1PF2)

 - ADIRU-3 (1PF3)

 - pitot or static probes

 - ECU (4000KS)

 - P0 inlet port

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  72-23-00-000-040 
AMM  72-23-00-280-003 
AMM  72-23-00-400-040 
AMM  73-21-40-000-001 
AMM  73-21-40-400-001 
AMM  73-21-50-000-042 
AMM  73-21-50-000-043 
AMM  73-21-50-210-001 
AMM  73-21-50-400-042 
AMM  73-21-50-400-043 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  73-21-60-740-007 

3. Fault Confirmation
__________________
 A. Not applicable
Removal of the PS12 LineInspection/Check of the PS12 LineInstallation of the PS12 LineRemoval of the T12 Temperature SensorInstallation of the T12 Temperature SensorRemoval of the HJ9 HarnessRemoval of the HJ10 HarnessVisual Inspection of the Wiring HarnessInstallation of the HJ9 HarnessInstallation of the HJ10 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Correct Time Limited Faults (Non Asterisked) of the Engine Scheduled Maintenance Report
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 4. Fault Isolation
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 A. The fault is triggered by the ECU if the ADIRU inputs data to the ECU (TAT, Total Pressure and Altitude) disagree with the engine sensor inputs (PS12 Sensing Line, T12 temperature sensor, P0).
 (1) If the failure message PO/P12/T12, ADC, ECU* or PO/P12/T12, ADC, ECU is displayed and one or more failure message(s) linked to the ADIRU-1 (1PF1), ADIRU-2 (1PF2), ADIRU-3 (1PF3), pitot or static probes is (are) present:
 - do the trouble shooting procedures related to the ADC, pitot probes or static probes failure message.
 B. If the fault message PO/P12/T12, ADC, ECU* or PO/P12/T12, ADC, ECU is displayed and no failure message linked to the ADC, static probes or pitot probes is (are) present:
 - Check in the Schedule Maintenance Report (SMR) or in the Class 3 Report (Ref. AMM TASK 73-21-60-740-007) for presence of failure message(s): "ECU (P0 SENSOR)", "T12 SNSR, J9, ECU", "T12 SNSR, J10, ECU", "ECU (PS12 SENSOR)".
 (1) If a fault is present:

 - do the trouble shooting per applicable procedure.

 (2) If no fault is found:

 - make sure there P0 inlet port located on the Pressure plate of the ECU (4000KS) is open and free from obstruction.
 (a) If damage is found:

 - clean the P0 inlet port,

 (b) If nothing is found:

 - do an inspection and check of the PS12 Sensor line (Ref. AMM TASK 72-23-00-280-003).
 1 if damage is found:
_
 - replace as required (Ref. AMM TASK 72-23-00-000-040) and (Ref. AMM TASK 72-23-00-400-040).
 2 if nothing is found, continues the troubleshooting as follows:
_
 (3) disconnect the J9 and J10 harnesses from the ECU (4000KS), and visually examine the ECU receptacles and the harnesses connectors for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-001):
 (a) If damage is found:

 - clean or repair damaged parts as required.

 (b) If nothing is found:

 - replace the T12 temperature sensor (Ref. AMM TASK 73-21-40-000-001) and (Ref. AMM TASK 73-21-40-400-001).
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_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 a If the fault continues:
_
 - replace the faulty harness: J9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042), and J10 harness (Ref. AMM TASK 73-21-50-000-043) and (Ref. AMM TASK 73-21-50-400-043).
　
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